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Re: [OpenDivX] I want to implement a 2 pass vbr encoder


Official MPEG4 reference software :

there is momosys, ms fdis and some std.(too old, 1998 year.. as i know
updates is not publicly available..).



----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Thursday, March 08, 2001 1:29 PM
Subject: [OpenDivX] I want to implement a 2 pass vbr encoder

> Hi,
> I have a lot of spare time and would like to implement a 2 pass VBR
> algorithm in encore. In order to do that I'm reading this:
> http://www.research.ibm.com/journal/rd/434/westerink.html
> This document describes an implementation of a 2 pass MPEG-2 vbr encoder.
> that it first does a first CBR pass, gathering statistics, processes them
> order to obtain control parameters for the second pass. Then during the
> pass there is a bitrate control process that takes into account the
> error.
> I also grabbed the encore sources and I'm looking into rc_q2.c and
> I have noticed that the bitrate modelling algorithm in the encore sources
> not a CBR algorithm but rather an ABR algorithm (Average Bit Rate). In
order to
> implement a 2 pass encoder I need to first implement a true CBR rate
control, a
> strong one like in MPEG-1 or MPEG-2.
> I will go and grab rate control sources for MPEG-1 and MPEG-2 CBR and
> them into encore. Then I will implement the statistics processing and VBR
> control process.
> I begin in this video compression field but I have a lot of time and I
have C
> programming skills on Unix.
> Where can I find good documentation about MoMuSys MPEG-4 implementation
> MPEG-4 standard? Could Adam Li, the author of rc_q2.c help me a little by
> explaining me how it works so that I don't begin at 0.
> _______________________________________________
> OpenDivX mailing list
> [email protected]
> http://lists.projectmayo.com/mailman/listinfo/opendivx

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